This site should give you the information you need:

http://www.eattheweeds.com/maypops-food-fun-medicine-2/

Here is a link that might be useful: Edible Passiflora in Florida

I know this is an old post, but to anyone trying to get fruit from p. vitifolia, you will need another passionflower to do it. i.e.: P. Vitifolia needs a pollinating passion, such as edulis cultivar, in order to fruit. It will not pollinate itself. And the fruits are delicious! If you choose p. edulis as your pollinator, they taste just a bit subacid and richly sweet.
BTW, P. edulis is self-fruitful, as long as you have bees, ants or butterflies to kiss one flower to the next. Or diy with a cheap paintbrush.

This post was edited by MsMorningSong on Fri, Dec 27, 13 at 14:22